Defensive publication



'7 X e 6 0 5 DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Publishedat the request of the applicant or owner in accordance with the Noticeof Apr. 11, 1968, 849 0.G. 1221. Identification is by serial number ofthe application and the heading indicates the number of pages ofspecification, including claims, and of sheets of drawing contained inthe application as originally filed. The file of this application isavailable to the public for inspection; reproduction may be purchasedfor 80 cents per sheet.

Applications published under the Defensive Publication Program have notbeen examined as to the merits of alleged invention. The Patent Oflicemakes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED MARCH 25, 1969 613 735 AZIRIDINYL PHOSPHIhlE OXIDE 0R SULFIDE-SULFUR DIOXIDE TREATMENT Duane L. Kenaga, 4622 Chatham Court, Midland,Mich. 48640 Filed Feb. 3, 1967. Published Mar. 25, 1969 Class 11762.1 NoDrawing. 17 Pages Specification A cellulosic substrate (e.g., wood,paper, or a textile) is impregnated with an aziridinyl phosphine oxideor sulfido [e.g., tris(1-aziridinyl) phosphine oxide oxide] by: (1)contacting the substrate with a solution of the aziridinyl phosphineoxide or sulfide in an inert solvent;

and.

(2) contacting the impregnated cellulosic substrate with sulfur dioxidefor a time sufficient to allow the sulfur dioxide to diffuse to the siteof the aziridinyl phosphine oxide or sulfide in the impregnatedcellulosic substrate and to combine chemically therewith.

When cellulosic substrates are treated according to this process, curingof the aziridinyl phosphine oxide may be carried out at ambienttemperatures. The treatment has increased stability against leaching bywater if the substrate is treated to remove the solvent afterimpregnation by the aziridinyl phosphine oxide or sulfide and before thesulfur dioxide treatment.

